Lossless image optimization

[FlipFloop]

No description provided.

[liushuyu]

Thanks for your PR! How did you optimize these images though? Also, looks like the changes weren't totally lossless, rather they were too small to notice.

[FlipFloop]

It's just SVG compression and only lossless algorithms were used!

[liushuyu]

It's just SVG compression and only lossless algorithms were used!

Okay then.

I can see you also introduced public/.DS_Store file which I think it's unintended. Would mind removing it?

[Spekular]

Also, looks like the changes weren't totally lossless, rather they were too small to notice.

Worth noting that zopflipng does truly visually lossless compression. (In other words, the resulting pixel data shown will be identical to the original, but stuff like metadata that doesn't affect pixel color might be lost.) For this case though, perceptually lossless seems fine.

Zopfli beats PNGOut, and PNGOut beats OptiPNG. If we're ok with lossy, pngquant appears to be a good choice.

[Spekular]

Also, SVG compression doesn't explain how the PNGs were compressed, which is the majority of the changes in this PR.

[Spekular]

PNGQuant beat OPs compression for logo and project icons at large and medium sizes. Otherwise OPs is better. img - quant.zip

However, I think we should leave the logo and project images (truly) lossless, since they're provided for download in the branding section they should be as high quality as possible.

[liushuyu]

Looks like this PR went stale.

To summarize, the OP probably need to:

1. Remove all the .DS_Store clutter
2. lmms-64x64.svg lmms-project-64x64.svg logo_lg.png project_lg.png should not be compressed since these files are meant to be downloaded in full quality with all the metadata intact (see https://lmms.io/branding)

Otherwise LGTM

[FlipFloop]

@liushuyu Sure for the .DS_store

However, this is lossless optimization --> quality is not affected!

[lukas-w]

@FlipFloop Once you've removed public/.DS_Store, this will be good to merge.